In the last year, I've put about 3000 rounds (mostly steel) through my M&P15 MOE, and haven't had a single issue regarding functionality or accuracy. I think they're fine rifles, given that they're made on a production line.
You can spend the money and replace your S&W barrel with a Noveske item, but before you do, ask yourself this - is that fancy new barrel going to give you anything tangible that you S&W barrel didn't? Is it going to make you noticeably more accurate? Is it going to last appreciably longer? Can you shoot steel ammo with it?
All you can really do is buy the best you can afford, and hope that's enough. When the time comes, replace the worn parts with something better. When my original S&W barrel wears out, I'll get a replacement that uses better steel, and is mid-length with a 1:8 twist. Will it be a Noveske? I don't know, but in all honesty, it depends on what I can (or want to) afford?
I'm not worried about what other people on that other board think of my rifles, or how I equip them. I sleep pretty good at night.
BTW, I built my own AR with a 16-inch stainless 1:8 barrel from BlackHole Weaponry. It works great as well.